include/linux/net.h

   1 /*
   2  * NET          An implementation of the SOCKET network access protocol.
   3  *              This is the master header file for the Linux NET layer,
   4  *              or, in plain English: the networking handling part of the
   5  *              kernel.
   6  *
   7  * Version:     @(#)net.h       1.0.3   05/25/93
   8  *
   9  * Authors:     Orest Zborowski, <obz@Kodak.COM>
  10  *              Ross Biro
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *
  13  *              This program is free software; you can redistribute it and/or
  14  *              modify it under the terms of the GNU General Public License
  15  *              as published by the Free Software Foundation; either version
  16  *              2 of the License, or (at your option) any later version.
  17  */
  18 #ifndef _LINUX_NET_H
  19 #define _LINUX_NET_H
  20
  21 #include <linux/wait.h>
  22 #include <linux/socket.h>
  23 #include <linux/fcntl.h>        /* For O_CLOEXEC and O_NONBLOCK */
  24 #include <asm/socket.h>
  25
  26 struct poll_table_struct;
  27 struct pipe_inode_info;
  28 struct inode;
  29 struct net;
  30
  31 #define NPROTO          AF_MAX
  32
  33 #define SYS_SOCKET      1               /* sys_socket(2)                */
  34 #define SYS_BIND        2               /* sys_bind(2)                  */
  35 #define SYS_CONNECT     3               /* sys_connect(2)               */
  36 #define SYS_LISTEN      4               /* sys_listen(2)                */
  37 #define SYS_ACCEPT      5               /* sys_accept(2)                */
  38 #define SYS_GETSOCKNAME 6               /* sys_getsockname(2)           */
  39 #define SYS_GETPEERNAME 7               /* sys_getpeername(2)           */
  40 #define SYS_SOCKETPAIR  8               /* sys_socketpair(2)            */
  41 #define SYS_SEND        9               /* sys_send(2)                  */
  42 #define SYS_RECV        10              /* sys_recv(2)                  */
  43 #define SYS_SENDTO      11              /* sys_sendto(2)                */
  44 #define SYS_RECVFROM    12              /* sys_recvfrom(2)              */
  45 #define SYS_SHUTDOWN    13              /* sys_shutdown(2)              */
  46 #define SYS_SETSOCKOPT  14              /* sys_setsockopt(2)            */
  47 #define SYS_GETSOCKOPT  15              /* sys_getsockopt(2)            */
  48 #define SYS_SENDMSG     16              /* sys_sendmsg(2)               */
  49 #define SYS_RECVMSG     17              /* sys_recvmsg(2)               */
  50 #define SYS_PACCEPT     18              /* sys_paccept(2)               */
  51
  52 typedef enum {
  53         SS_FREE = 0,                    /* not allocated                */
  54         SS_UNCONNECTED,                 /* unconnected to any socket    */
  55         SS_CONNECTING,                  /* in process of connecting     */
  56         SS_CONNECTED,                   /* connected to socket          */
  57         SS_DISCONNECTING                /* in process of disconnecting  */
  58 } socket_state;
  59
  60 #define __SO_ACCEPTCON  (1 << 16)       /* performed a listen           */
  61
  62 #ifdef __KERNEL__
  63 #include <linux/stringify.h>
  64 #include <linux/random.h>
  65
  66 #define SOCK_ASYNC_NOSPACE      0
  67 #define SOCK_ASYNC_WAITDATA     1
  68 #define SOCK_NOSPACE            2
  69 #define SOCK_PASSCRED           3
  70 #define SOCK_PASSSEC            4
  71
  72 #ifndef ARCH_HAS_SOCKET_TYPES
  73 /**
  74  * enum sock_type - Socket types
  75  * @SOCK_STREAM: stream (connection) socket
  76  * @SOCK_DGRAM: datagram (conn.less) socket
  77  * @SOCK_RAW: raw socket
  78  * @SOCK_RDM: reliably-delivered message
  79  * @SOCK_SEQPACKET: sequential packet socket
  80  * @SOCK_DCCP: Datagram Congestion Control Protocol socket
  81  * @SOCK_PACKET: linux specific way of getting packets at the dev level.
  82  *                For writing rarp and other similar things on the user level.
  83  *
  84  * When adding some new socket type please
  85  * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
  86  * overrides this enum for binary compat reasons.
  87  */
  88 enum sock_type {
  89         SOCK_STREAM     = 1,
  90         SOCK_DGRAM      = 2,
  91         SOCK_RAW        = 3,
  92         SOCK_RDM        = 4,
  93         SOCK_SEQPACKET  = 5,
  94         SOCK_DCCP       = 6,
  95         SOCK_PACKET     = 10,
  96 };
  97
  98 #define SOCK_MAX (SOCK_PACKET + 1)
  99 /* Mask which covers at least up to SOCK_MASK-1.  The
 100  * remaining bits are used as flags. */
 101 #define SOCK_TYPE_MASK 0xf
 102
 103 /* Flags for socket, socketpair, paccept */
 104 #define SOCK_CLOEXEC    O_CLOEXEC
 105 #ifndef SOCK_NONBLOCK
 106 #define SOCK_NONBLOCK   O_NONBLOCK
 107 #endif
 108
 109 #endif /* ARCH_HAS_SOCKET_TYPES */
 110
 111 enum sock_shutdown_cmd {
 112         SHUT_RD         = 0,
 113         SHUT_WR         = 1,
 114         SHUT_RDWR       = 2,
 115 };
 116
 117 /**
 118  *  struct socket - general BSD socket
 119  *  @state: socket state (%SS_CONNECTED, etc)
 120  *  @type: socket type (%SOCK_STREAM, etc)
 121  *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
 122  *  @ops: protocol specific socket operations
 123  *  @fasync_list: Asynchronous wake up list
 124  *  @file: File back pointer for gc
 125  *  @sk: internal networking protocol agnostic socket representation
 126  *  @wait: wait queue for several uses
 127  */
 128 struct socket {
 129         socket_state            state;
 130         short                   type;
 131         unsigned long           flags;
 132         const struct proto_ops  *ops;
 133         struct fasync_struct    *fasync_list;
 134         struct file             *file;
 135         struct sock             *sk;
 136         wait_queue_head_t       wait;
 137 };
 138
 139 struct vm_area_struct;
 140 struct page;
 141 struct kiocb;
 142 struct sockaddr;
 143 struct msghdr;
 144 struct module;
 145
 146 struct proto_ops {
 147         int             family;
 148         struct module   *owner;
 149         int             (*release)   (struct socket *sock);
 150         int             (*bind)      (struct socket *sock,
 151                                       struct sockaddr *myaddr,
 152                                       int sockaddr_len);
 153         int             (*connect)   (struct socket *sock,
 154                                       struct sockaddr *vaddr,
 155                                       int sockaddr_len, int flags);
 156         int             (*socketpair)(struct socket *sock1,
 157                                       struct socket *sock2);
 158         int             (*accept)    (struct socket *sock,
 159                                       struct socket *newsock, int flags);
 160         int             (*getname)   (struct socket *sock,
 161                                       struct sockaddr *addr,
 162                                       int *sockaddr_len, int peer);
 163         unsigned int    (*poll)      (struct file *file, struct socket *sock,
 164                                       struct poll_table_struct *wait);
 165         int             (*ioctl)     (struct socket *sock, unsigned int cmd,
 166                                       unsigned long arg);
 167         int             (*compat_ioctl) (struct socket *sock, unsigned int cmd,
 168                                       unsigned long arg);
 169         int             (*listen)    (struct socket *sock, int len);
 170         int             (*shutdown)  (struct socket *sock, int flags);
 171         int             (*setsockopt)(struct socket *sock, int level,
 172                                       int optname, char __user *optval, int optlen);
 173         int             (*getsockopt)(struct socket *sock, int level,
 174                                       int optname, char __user *optval, int __user *optlen);
 175         int             (*compat_setsockopt)(struct socket *sock, int level,
 176                                       int optname, char __user *optval, int optlen);
 177         int             (*compat_getsockopt)(struct socket *sock, int level,
 178                                       int optname, char __user *optval, int __user *optlen);
 179         int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
 180                                       struct msghdr *m, size_t total_len);
 181         int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
 182                                       struct msghdr *m, size_t total_len,
 183                                       int flags);
 184         int             (*mmap)      (struct file *file, struct socket *sock,
 185                                       struct vm_area_struct * vma);
 186         ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
 187                                       int offset, size_t size, int flags);
 188         ssize_t         (*splice_read)(struct socket *sock,  loff_t *ppos,
 189                                        struct pipe_inode_info *pipe, size_t len, unsigned int flags);
 190 };
 191
 192 struct net_proto_family {
 193         int             family;
 194         int             (*create)(struct net *net, struct socket *sock, int protocol);
 195         struct module   *owner;
 196 };
 197
 198 struct iovec;
 199 struct kvec;
 200
 201 enum {
 202         SOCK_WAKE_IO,
 203         SOCK_WAKE_WAITD,
 204         SOCK_WAKE_SPACE,
 205         SOCK_WAKE_URG,
 206 };
 207
 208 extern int           sock_wake_async(struct socket *sk, int how, int band);
 209 extern int           sock_register(const struct net_proto_family *fam);
 210 extern void          sock_unregister(int family);
 211 extern int           sock_create(int family, int type, int proto,
 212                                  struct socket **res);
 213 extern int           sock_create_kern(int family, int type, int proto,
 214                                       struct socket **res);
 215 extern int           sock_create_lite(int family, int type, int proto,
 216                                       struct socket **res);
 217 extern void          sock_release(struct socket *sock);
 218 extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
 219                                   size_t len);
 220 extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
 221                                   size_t size, int flags);
 222 extern int           sock_map_fd(struct socket *sock, int flags);
 223 extern struct socket *sockfd_lookup(int fd, int *err);
 224 #define              sockfd_put(sock) fput(sock->file)
 225 extern int           net_ratelimit(void);
 226 extern long          do_accept(int fd, struct sockaddr __user *upeer_sockaddr,
 227                                int __user *upeer_addrlen, int flags);
 228
 229 #define net_random()            random32()
 230 #define net_srandom(seed)       srandom32((__force u32)seed)
 231
 232 extern int           kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 233                                     struct kvec *vec, size_t num, size_t len);
 234 extern int           kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 235                                     struct kvec *vec, size_t num,
 236                                     size_t len, int flags);
 237
 238 extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
 239                        int addrlen);
 240 extern int kernel_listen(struct socket *sock, int backlog);
 241 extern int kernel_accept(struct socket *sock, struct socket **newsock,
 242                          int flags);
 243 extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
 244                           int addrlen, int flags);
 245 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
 246                               int *addrlen);
 247 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
 248                               int *addrlen);
 249 extern int kernel_getsockopt(struct socket *sock, int level, int optname,
 250                              char *optval, int *optlen);
 251 extern int kernel_setsockopt(struct socket *sock, int level, int optname,
 252                              char *optval, int optlen);
 253 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 254                            size_t size, int flags);
 255 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
 256 extern int kernel_sock_shutdown(struct socket *sock,
 257                                 enum sock_shutdown_cmd how);
 258
 259 #ifndef CONFIG_SMP
 260 #define SOCKOPS_WRAPPED(name) name
 261 #define SOCKOPS_WRAP(name, fam)
 262 #else
 263
 264 #define SOCKOPS_WRAPPED(name) __unlocked_##name
 265
 266 #define SOCKCALL_WRAP(name, call, parms, args)          \
 267 static int __lock_##name##_##call  parms                \
 268 {                                                       \
 269         int ret;                                        \
 270         lock_kernel();                                  \
 271         ret = __unlocked_##name##_ops.call  args ;\
 272         unlock_kernel();                                \
 273         return ret;                                     \
 274 }
 275
 276 #define SOCKCALL_UWRAP(name, call, parms, args)         \
 277 static unsigned int __lock_##name##_##call  parms       \
 278 {                                                       \
 279         int ret;                                        \
 280         lock_kernel();                                  \
 281         ret = __unlocked_##name##_ops.call  args ;\
 282         unlock_kernel();                                \
 283         return ret;                                     \
 284 }
 285
 286
 287 #define SOCKOPS_WRAP(name, fam)                                 \
 288 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))     \
 289 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
 290               (sock, uaddr, addr_len))                          \
 291 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
 292                               int addr_len, int flags),         \
 293               (sock, uaddr, addr_len, flags))                   \
 294 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
 295               (sock1, sock2))                                   \
 296 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
 297                          int flags), (sock, newsock, flags)) \
 298 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
 299                          int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
 300 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
 301               (file, sock, wait)) \
 302 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
 303                          unsigned long arg), (sock, cmd, arg)) \
 304 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \
 305                          unsigned long arg), (sock, cmd, arg)) \
 306 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
 307 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
 308 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
 309                          char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
 310 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
 311                          char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
 312 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
 313               (iocb, sock, m, len)) \
 314 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
 315               (iocb, sock, m, len, flags)) \
 316 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
 317               (file, sock, vma)) \
 318               \
 319 static const struct proto_ops name##_ops = {                    \
 320         .family         = fam,                          \
 321         .owner          = THIS_MODULE,                  \
 322         .release        = __lock_##name##_release,      \
 323         .bind           = __lock_##name##_bind,         \
 324         .connect        = __lock_##name##_connect,      \
 325         .socketpair     = __lock_##name##_socketpair,   \
 326         .accept         = __lock_##name##_accept,       \
 327         .getname        = __lock_##name##_getname,      \
 328         .poll           = __lock_##name##_poll,         \
 329         .ioctl          = __lock_##name##_ioctl,        \
 330         .compat_ioctl   = __lock_##name##_compat_ioctl, \
 331         .listen         = __lock_##name##_listen,       \
 332         .shutdown       = __lock_##name##_shutdown,     \
 333         .setsockopt     = __lock_##name##_setsockopt,   \
 334         .getsockopt     = __lock_##name##_getsockopt,   \
 335         .sendmsg        = __lock_##name##_sendmsg,      \
 336         .recvmsg        = __lock_##name##_recvmsg,      \
 337         .mmap           = __lock_##name##_mmap,         \
 338 };
 339
 340 #endif
 341
 342 #define MODULE_ALIAS_NETPROTO(proto) \
 343         MODULE_ALIAS("net-pf-" __stringify(proto))
 344
 345 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
 346         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
 347
 348 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
 349         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 350                      "-type-" __stringify(type))
 351
 352 #ifdef CONFIG_SYSCTL
 353 #include <linux/sysctl.h>
 354 extern struct ratelimit_state net_ratelimit_state;
 355 #endif
 356
 357 #endif /* __KERNEL__ */
 358 #endif  /* _LINUX_NET_H */